Cooling fan with fluid control device

ABSTRACT

A cooling fan with fluid control device comprises a fan blade assembly and a frame member. The frame member provides a hub seat movably attached with the fan blade assembly and formed with a plurality of fluid control elements at the inner side thereof to control radial pressure of fluid. The frame member at least has a fluid guide part connected to the fluid control elements with a first through hole and a second through hole being in the fluid guide part and the first through hole being greater than the second through hole. When the fan blade assembly rotates to move the fluid, the fluid can flow toward the center of the frame member by way of the fluid control elements and the fluid guide part to increase the amount of the fluid at the rear side of the hub seat.

BACKGROUND OF THE INVENTION

1. Field of Invention

The present invention is related to a cooling fan with fluid controldevice and particularly to a fan structure in which fluid passingthrough a frame member can be congregated to increase the amount offluid at the rear side of a hub seat largely.

2. Brief Description of Related Art

Referring to FIGS. 1 to 4, Taiwanese Patent application No. 92209126entitled AIR OUTLET CONTROL UNIT filed by the present inventor comprisesa frame member and a fan 12 movably attached to the frame member 11. Theframe member 11 has an inlet 111 and an outlet 112 available for thefluid entering and leaving and is provided with a hub seat 114 to bemovably attached with the fan 12. The frame member 11 at the inner sidethereof is formed with fluid control elements 113, which jut outwardwith an end part respectively. When the fan 12 rotates to allow thefluid flowing through the inlet 111 and the outlet 112, the fluidcontrol elements 113 can change the flow of the fluid and increaseradial pressure of the fluid such that the fluid can be congregated toincrease the fluid flow at the center of the rear side of the hub seat114. In this way, the stagnation area at the rear side of the hub seat114 can be reduced to enhance heat dissipation efficiency.

However, although the preceding prior art can perform basic function offluid flowing, it still has defects in dealing with congregating thefluid effectively.

SUMMARY OF THE INVENION

Accordingly, an object of the present invention is to provide a coolingfan with fluid control device in which a fluid guide part is provided tohave a first through hole greater than a second through hole so as toincrease the fluid flowing toward the center of the frame member whilethe fluid control elements in the frame member connects with the firstand the second through holes for enhancing the heat dissipationefficiency.

The cooling fan with fluid control device according to the presentinvention comprises a fan blade assembly and a frame member. The framemember provides a hub seat movably attached with the fan blade assemblyand formed with a plurality of fluid control elements at the inner sidethereof to control radial pressure of fluid. The frame member at leasthas a fluid guide part with at least a joining part and a first throughhole and a second through hole being connected to the fluid controlelements and the first through hole being greater than the secondthrough hole. When the fan blade assembly rotates to move the fluid, thefluid can flow toward the center of the frame member by way of the fluidcontrol elements and the fluid guide part to increase the amount of thefluid at the rear side of the hub seat.

BRIEF DESCRIPTION OF THE DRAWINGS

The detail structure, the applied principle, the function and theeffectiveness of the present invention can be more fully understood withreference to the following description and accompanying drawings, inwhich:

FIG. 1 is an exploded perspective of a cooling fan with a conventionalfluid control device;

FIG. 2 is another exploded perspective of the conventional fluid controldevice shown in FIG. 1;

FIG. 3 is a perspective view of the conventional fluid control device;

FIG. 4 is a plan view illustrating flow direction of fluid of aconventional device;

FIG. 5 is an exploded perspective view of the first embodiment accordingto the present invention;

FIG. 6 is a top view of a frame member of the first preferred embodimentshown in FIG. 5;

FIG. 7 is another exploded perspective view of the first preferredembodiment according to the present invention;

FIG. 8 is an assembled perspective view of the first embodimentaccording to the present invention;

FIG. 9 is a plan view of the first embodiment illustrating flowdirection of fluid;

FIG. 10 is an exploded perspective view of the second preferredembodiment according to the present invention;

FIG. 11 is a top view of a frame member of the first preferredembodiment shown in FIG. 10;

FIG. 12 is another exploded perspective view of the second preferredembodiment according to the present invention;

FIG. 13 is an assembled perspective view of the first embodimentaccording to the present invention;

FIG. 14 is a plan view of the second embodiment illustrating flowdirection of fluid; and

FIG. 15 is a sectional view illustrating another shape of the hub in thesecond embodiment according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIGS. 5 to 8, a cooling fan with fluid control according tothe present invention in the first preferred embodiment is illustrated.The cooling fan comprises a frame member 21 and a fan blade assembly 22.The frame 21 at the inner side thereof is formed with a plurality offluid control elements 212 with each of the fluid control elements 212jutting outward and having an end part. The fluid control elements 212provided in the first embodiment are guiding blades to change radialpressure of the fluid such that the fluid can flow toward outer centerof the frame member 21 without diffusing outward immediately. The endparts of the fluid control elements 212 is connected to a fluid guidepart 213, which has a first through hole 2131 and a second through hole2132, and the first through hole 2131 is greater than the second throughhole 2132 to force the fluid flowing toward the center of the framemember 21. A hub seat 215 is provided in the frame member 21 and atleast a joining part 214, which has a shape similar to the fluid controlelements 212, is disposed at the periphery of the hub seat 215 toconnect with the fluid guide part 231. The fan blade assembly 22 ismovably attached to the hub seat 215 in the frame member 21.

Referring to FIG. 9, the fan blade assembly 22 rotates to drag the fluidflowing and the fluid passes through the fluid control elements 212 andthe fluid guide part 213. The fluid passing through the fluid controlelements 212 is controlled by the fluid control elements 212 and theradial pressure of the fluid becomes greater to flow toward rear side ofthe hub seat 215. The fluid passing through the fluid guide part 213flows into the fan via the first through hole 2131 and flows out via thesecond through hole 2132. The fluid congregates and flows toward theframe member 21 and the rear side of the hub seat 215 after flowing outvia the second though hole 2132 due to the first through hole 2131 beinggreater than the second through hole 2132. A large amount of fluid movestoward the center of the frame member 21 and the flow rate of the fluidat the rear side of the hub seat 215 increases to reduce the stagnationarea at the rear side of the hub seat 215 tremendously. Hence, the heatdissipation efficiency can be enhanced effectively.

Referring to FIGS. 10 to 14, the second embodiment of the presentinvention is illustrated. The entire structure and function are similarto the preceding embodiment so that no detail will be described further.The difference of the second embodiment from the first embodiment is inthat the hub seat 315 of the frame member 21 provides a configurationslanting outward from the upper section to the lower section with asmall upper section and a large lower part, such that the fluid can flowthrough the first through hole 2231 of the fluid guide part 213 andmoves out via the second through hole 2232 toward rear center of the hubseat 315 of the frame member 21. In this way, the flow direction of thefluid can be controlled to increase the flow rate of the fluid at rearside of the hub seat 315 such that it can enhance the heat dissipationefficiency.

Referring to FIG. 15, it can be provided with another hub seat 415,which is shaped to diverge from the lower section to the upper section,and the hub seat 415 also can achieve the purpose that the fluid can becontrolled to flow toward the rear side of the hub seat 415 of the framemember 21 to enhance the heat dissipation efficiency.

While the invention has been described with referencing to the preferredembodiments thereof, it is to be understood that modifications orvariations may be easily made without departing from the spirit of thisinvention, which is defined by the appended claims.

1. A cooling fan with fluid control device, comprising: a fan bladeassembly; a frame member, providing a hub seat being movably attachedwith the fan blade assembly, being formed with a plurality of fluidcontrol elements at the inner side thereof to control radial pressure offluid, having at least a fluid guide part being connected to the fluidcontrol elements with a first through hole and a second through holebeing in the fluid guide part and the first through hole being greaterthan the second through hole; whereby, the fluid can be controlled toincrease the amount thereof at the rear side of the hub seat.
 2. Thecooling fan with fluid control device as defined in claim 1, wherein thehub seat is provided with at least a joining part to connect with fluidguide part.
 3. The cooling fan with fluid control device as defined inclaim 2, wherein the joining part is shaped being similar to the fluidcontrol elements.
 4. The cooling fan with fluid control device asdefined in claim 1, wherein the fluid control elements are guide blades.5. The cooling fan with fluid control device as defined in claim 1,wherein the hub seat is divergent from the upper section to the lowersection thereof.
 6. The cooling fan with fluid control device as definedin claim 1, wherein the hub seat is convergent from the upper section tothe lower section.